#173C81#173C81

#173C81 is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.3% C 0.124 H 261.4°. Best body text is #FFFFFF at 10.50:1 contrast (WCAG AA passes).

Color values

HEX	#173C81
RGB	rgb(23, 60, 129)
HSL	hsl(219, 70%, 30%)
HSV	hsv(219, 82%, 51%)
CMYK	cmyk(82.2%, 53.5%, 0%, 49.4%)
CIE-LAB	lab(26.73, 14.13, -42.64)
CIE-LCH	lch(26.73, 44.92, 288.34°)
OKLab	oklab(37.31% -0.0185 -0.1228)
OKLCH	oklch(37.31% 0.124 261.4)
XYZ	xyz(5.9302, 4.9982, 21.4168)
Luminance	0.0500 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173C81 #815C17

analogous

#177181 #173C81 #271781

triadic

#173C81 #81173C #3C8117

tetradic

#173C81 #811771 #815C17 #178127

square

#173C81 #811771 #815C17 #178127

split-complementary

#173C81 #812717 #718117

monochromatic

#050C1A #0E244D #173C81 #2054B5 #3770DB

Accessibility & contrast

On white

10.50

#173C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#173C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173C81

10.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173C81	#FFFFFF	#000000	##FFFFFF
##173C81	1.00	10.50	2.00	10.50
#FFFFFF	10.50	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D4483

Deuteranopia (green-blind)

#003B80

Tritanopia (blue-blind)

#004D58

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173c81;
/* rgb */ color: rgb(23, 60, 129);
/* oklch */ color: oklch(37.3% 0.124 261.4);

Tailwind

colors: {
  custom: {
    50: '#6771a6',
    500: '#173c81',
    950: '#000000',
  },
}

SCSS

$custom: #173c81;
$custom-light: #6771a6;
$custom-dark: #000000;

JSON

{
  "hex": "#173c81",
  "rgb": {
    "r": 23,
    "g": 60,
    "b": 129
  },
  "hsl": {
    "h": 219.057,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.37313,
    "c": 0.12421,
    "h": 261.4
  },
  "luminance": 0.04999
}

Semantic roles & 50–950 ramp

primary

#173C81

secondary

#B58C3E

accent

#AF3BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173C81

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →